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annotate src/org/tmatesoft/hg/internal/DataSerializer.java @ 697:24f4efedc9d5

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 06 Aug 2013 13:34:34 +0200
parents 545b1d4cc11d
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1 /*
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2 * Copyright (c) 2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.io.ByteArrayOutputStream;
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20 import java.io.IOException;
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21 import java.io.OutputStream;
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22
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23 import org.tmatesoft.hg.core.HgIOException;
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24 import org.tmatesoft.hg.repo.HgRuntimeException;
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25
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26 /**
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27 * Serialization friend of {@link DataAccess}, similar to OutputStream with few handy methods
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28 *
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29 * @author Artem Tikhomirov
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30 * @author TMate Software Ltd.
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31 */
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32 @Experimental(reason="Work in progress")
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33 public class DataSerializer {
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34 private byte[] buffer;
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35
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36 public void writeByte(byte... values) throws HgIOException {
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37 write(values, 0, values.length);
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38 }
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39
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40 public void writeInt(int... values) throws HgIOException {
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41 ensureBufferSize(4*values.length); // sizeof(int)
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42 int idx = 0;
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43 for (int v : values) {
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44 bigEndian(v, buffer, idx);
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45 idx += 4;
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46 }
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47 write(buffer, 0, idx);
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48 }
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49
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50 public void write(byte[] data, int offset, int length) throws HgIOException {
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51 throw new HgIOException("Attempt to write to non-existent file", null);
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52 }
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54 public void done() throws HgIOException {
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55 // no-op
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56 }
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58 private void ensureBufferSize(int bytesNeeded) {
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59 if (buffer == null || buffer.length < bytesNeeded) {
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60 buffer = new byte[bytesNeeded];
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61 }
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62 }
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64 /**
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65 * Writes 4 bytes of supplied value into the buffer at given offset, big-endian.
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66 */
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67 public static final void bigEndian(int value, byte[] buffer, int offset) {
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68 assert offset + 4 <= buffer.length;
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69 buffer[offset++] = (byte) ((value >>> 24) & 0x0ff);
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70 buffer[offset++] = (byte) ((value >>> 16) & 0x0ff);
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71 buffer[offset++] = (byte) ((value >>> 8) & 0x0ff);
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72 buffer[offset++] = (byte) (value & 0x0ff);
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73 }
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74
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75 /**
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76 * Denotes an entity that wants to/could be serialized
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77 */
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78 @Experimental(reason="Work in progress")
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79 public interface DataSource {
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80 /**
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81 * Invoked once for a single write operation,
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82 * although the source itself may get serialized several times
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83 */
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84 public void serialize(DataSerializer out) throws HgIOException, HgRuntimeException;
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85
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86 /**
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87 * Hint of data length it would like to writes
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88 * @return -1 if can't answer
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89 */
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90 public int serializeLength() throws HgRuntimeException;
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91 }
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93 public static class ByteArrayDataSource implements DataSource {
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95 private final byte[] data;
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96
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97 public ByteArrayDataSource(byte[] bytes) {
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98 data = bytes;
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99 }
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100
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101 public void serialize(DataSerializer out) throws HgIOException {
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102 if (data != null) {
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103 out.write(data, 0, data.length);
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104 }
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105 }
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106
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107 public int serializeLength() {
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108 return data == null ? 0 : data.length;
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109 }
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110 }
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111
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112 /**
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113 * Serialize data to byte array
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114 */
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115 public static class ByteArraySerializer extends DataSerializer {
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116 private final ByteArrayOutputStream out = new ByteArrayOutputStream();
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117
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118 @Override
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119 public void write(byte[] data, int offset, int length) {
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120 out.write(data, offset, length);
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121 }
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122
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123 public byte[] toByteArray() {
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124 return out.toByteArray();
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125 }
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126 }
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127
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128 /**
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129 * Bridge to the world of {@link java.io.OutputStream}.
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130 * Caller instantiates the stream and is responsible to close it as appropriate,
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131 * {@link #done() DataSerializer.done()} doesn't close the stream.
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132 */
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133 public static class OutputStreamSerializer extends DataSerializer {
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134 private final OutputStream out;
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135
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136 public OutputStreamSerializer(OutputStream outputStream) {
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137 out = outputStream;
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138 }
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139
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140 @Override
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141 public void write(byte[] data, int offset, int length) throws HgIOException {
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142 try {
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143 out.write(data, offset, length);
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144 } catch (IOException ex) {
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145 throw new HgIOException(ex.getMessage(), ex, null);
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146 }
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147 }
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148 }
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149 }